Value of endoscopic methylene blue and Lugol's iodine double staining and detection of GST-Π and telomerase in the early diagnosis of esophageal carcinoma

Table 5 Telomerase activity expression in various histological mucosa of esophagus (n, %)

Histology	n	Telomerase activity expression		Positive numberof telomerase (%)
		+	-
Low-grade dysplasia	17	2	15	2 (11.8)
Moderate-grade dysplasia	21	7	14	7 (33.3)
High-grade dysplasia	41	32	9	32 (78.0)

Comparing among dysplasias χ² = 25.10, P<0.005; there was significant difference between high- and low- or moderate-grade dysplasia (χ² = 21.77, P<0.005; χ² = 11.90, P<0.005, respectively), but no obvious difference between low- and moderate-grade dysplasia (χ² = 1.37, P>0.1).